Official NHA Assessment

Race 9: MARCUS JOHNSTON B STAKES (For All Horses with a nett rating of 101 & below)

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Line Horse
Abaddon
Reference for assessment
Exact Matches
1 / 9
Calculated = Official
Close Matches
3 / 9
Within 2 points
Significant Diffs
5 / 9
More than 5 points
Detailed Assessment
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Pos  Horse                Age  Weight  Fin  Lengths  WFA   Pre   Race Rating  New   Adj  
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1    Connery              4    56.0    1    0.00     0.0   93    89           89    -4
2    Abaddon              3    54.0    2    1.50     2.5   80    80           80    +0
3    Twenty One May       3    57.0    3    1.55     2.5   88    86           86    -2
4    Jet Legacy           5    55.5    4    2.15     0.0   84    88           88    +4
5    Mojo Man             4    60.0    5    2.65     0.0   92    97           97    +5
6    Rainbow Reward       5    57.0    6    3.35     0.0   86    91           91    +5
6    Smorgasbord          6    57.0    6    3.35     0.0   85    91           91    +6
8    Donquerari           5    60.0    8    5.55     0.0   99    97           97    -2
99   Holds The Key        2    51.0    99   0.00     1.5   -     76           76    +0
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Horse-by-Horse Comparison

Pos Horse Pre-Rating Official New Calculated Discrepancy WFA (kg) Line Horse Calculation
1 Connery 93 96 89 +7 0.0 -
2 Abaddon Line 80 80 80 ✓ Match 2.5
3 Twenty One May 88 91 86 +5 2.5 -
4 Jet Legacy 84 89 88 +1 0.0 -
5 Mojo Man 92 80 97 -17 0.0 -
6 Rainbow Reward 86 89 91 -2 0.0 -
6 Smorgasbord 85 77 91 -14 0.0 -
8 Donquerari 99 86 97 -11 0.0 -
99 Holds The Key - 83 76 +7 1.5 -
Assessment Methodology
Calculation Steps:
  1. Identify Line Horse - consistent performer used as reference
  2. Calculate WFA Allowance based on age, distance, and month
  3. Apply Drag Adjustment for beaten margin
  4. Calculate Actual Weight Performance:
    Weight - Drag - WFA
  5. Compare to Line Horse to determine race rating
  6. Apply special rules (maiden caps, layoff allowance)
Key Formulas:
  • Drag Effect: Varies by distance (see Benchmarks page)
  • 1 length ≈ 1kg at 1 mile (1600m)
  • WFA Scale: Based on Admiral Rous's 1855 table
  • Rating Points: 1kg = 2 rating points